Battery usage

Hi everyone,
been using my iPhone 6 since friday and have some battery usage behaviour that I can't quite figure out.

When I look at the per app usage I see things like Facebook, Skype and Youtube using up between 10-20% of my battery with "Background Activity".
I have disabled background app refresh completely, but they still use up a lot of battery. Even though I barely use them.

And last night I lost 15% battery in 7 hours. (While I was asleep)

Anyone else experiencing this?

 

no one else with these issues? youtube now hast 15% battery used, and i havent used the app all day.